Bicharb iiesteb wilcox



f NITED STATES PATENT OFFTGE.

ltCHAlEt/D LESTER wLCx, 0F WATERBURY, CONNECTICUT, ASSIGNOR T0 THE `lliTER- JBURY FAB/REL FOUNIDRY ANI) MACHINE COMPANY', OF WATERBUR-Y, CCNNECTICUT,

A. CQRPORATION OF CONNECTICUT.

DIES FOR TRIMMING BLANKS.

assises.

Specification of Letters Patent.

Patented Nov. 1a, 1919..

imputation sied November 7, isis. sensi No. seis/ii.

To all whom t may concern Be it known that I, RICHARD Lns'riin `WIL- cox, a citizen of the United States, and a resident of Wa-terbury, county of New Haven, State of Connecticut, have invented certain new and useful Improvements in Dies for Trimming Blanks, of wlfich the following is a specification.

My present invention relates to improvements in dies for giving a trimmed crosssection to a blank as is done,` for instance, in forming the square, hexagonal or octagonal shapes of bolt heads, nuts, and the like, or a many sided shape of any kind such, for instance, as a circular section with Hat sides as is formed on shackle bolts and the like. It will be understood that by polygon or polygonal I mean any such shape. A blank may also be cut so as to have a circular section.

@ne of the objects of my invention, among others, is to produce a series of dies arranged to work successively on a blank which will be easy to construct and to sharpen and at the same time will enable any polygonal shape to be trimmed by successive cuttings without the dies becoming clogged with chips. i

With this and other objects in View, my invention consists of the construction and arrangement lhereinafter described and pointed out in the appended claims.

ln the accompanying drawings, Figure 1 is a perspective view of a form of die which l have adopted for illustrative purposes, and which would norinallybe used `as the first die, that is the one into which the blank is passed first. y

Fig. 2 is a second die arranged to coperate with the die shown in Fig. 1.

Fig. 3 is a vertical section on 3 3, Fig. 4, through the dies shown in Fig. land Fig. 2 when placed in cooperative position.

Fig. L1 is a plan View of the dies shown in Figs. 1 and 2. l

The corresponding parts are referred to both in the drawings and the specification in `such a way as to forni cutting edges around the periphery of opening 11.

In Fig. 2 is shown a second die 14 which is `also provided with an opening 15 therethrough and surfaces 16 on a conical top portion 17, these surfaces being preferably, though not necessarily, Hat. The opening 1.5 is smaller than the opening1 11.

In operation, dies 10 and 14 are superimposed on each other, as best shown in Fig. 3, and to this end the base of' die l0 is preferably provided with a conical recess adapted to fit over the conical surface 17 of die 1l. As shown in Fig. 3, openings 11 and 15 are in alinement with each cutting edge of one die substantially in the same plane as one of the cutting edges of the other die.

As will be seen by an inspection of Fig. 3, the chips 'formed by the cutting edges on die l0 will readily sli-de down the top surface of the. die or down the surfaces 13 away from the cutting' edge. chips would tend to slide down the surfaces 16`of the die le but, in practice, this opening is insufficient so that preferably l provide supplemental recesses 18 in the bottom of the die 10 which, by being positioned in proper relation to the surface 16, provide a relatively large opening. Thus chips formed by the cutting edges on die 14 may readily pass to the exterior ofthe dies to prevent the cutting edges becoming clogged. v y

It will be understood that the cutting edges of each of the dies may `be readily sharpened by grinding the surfaces 13 and 16. It will also be understood that the cutting surfaces on the dies may be formed in any suitable manner other than by means of the surfaces 13 and 16, as illustrated.

It' will be also understood that while I have shown only two dies in cooperative relation, as many of such dies may be placed end to end as desired, so that the successive chips cut from the blank as it is passed through the openings 11, 15 and the like may be relatively small for the total amount of metal, to be removed, each die cutting only a small portion of this total. In such case, the additional dies would be preferably of the form shown in Fig. l, each having a conical top surface and a conical recess to lit over the top surface of the die next below it. It will also be understood that, for some purposes, the top surface of the dies may Similarly these be other than conical and, indeed, may be flat, provided that the cutting edges of the dies below the iirst die are formed by surfaces such as 16.

lVhile I have shown the illustrated form of dies as of the solid type, it Will be understood that such die may be also formed b v building up sections of steel, if desired.

1. A pair of dies, each having an opening therethrough, one opening being slightly smaller than the other, With cutting edges forming the periphery of one end of each opening, the dies being positioned together with the openings in alinenient and With each cutting edge on one die inV substantially the saine plane as a cutting edge on the other die, the base of the first die resting against the top of the second die and the base of the first die having openings extending from the cutting edges of the second die to the exterior of the dies.- y

2. A pair of dies, each having an opening therethrough, one opening being slightly smaller than the other, With cutting edges forming the periphery of one end of each opening, the dies being positioned together with theopenings in alinelnent and with each cutting edge on one die in substantially the saine plane as a cutting edge on the other die, the top of the second die being conical and contacting with a conical recess in the base of the first die, the base of the first die having openings extending from the cutting edges of the second die to the exterior of the dies.

3. A pair of dies, each having an opening therethrough, one opening being slightly snialler than the other, the top of the second die being conical and contacting With a conical recess in the base of the first die, the second die having a plurality of substantially dat surfaces on its top face, the yplanes of such surfaces making acute angles With the axis of the opening in the die and intersecting the edges of the opening to form a series of cutting edges in the periphery thereof, the first die having a series of cutting edges around the periphery of its opening and the two dies being positioned so that the openings therethrough are in alinelnent, with each cutting edge of one die in sul)A stantially the saine plane as a cutting edge on the other die, the base of the iirst die having a plurality of openings extending from the cutting edges of the second die to the exterior of the dies and each adjacent one of the flat faces on the second die.

t. A pair of dies, each having an opening therethrough, one opening being slightly smaller than the other, with cutting edges forming the periphery of one end of each opening, the dies being positioned together with the openings in alineinent and with each cutting edge on one die in substantially the saine plane as a cutting edge on the other die, the base of the first die resting against the top of the second die, the dies being provided with openings extending from the eutting edges of the second die to the exterior of the dies.

5. A pair of dies, each having an opening therethrough, one opening being slightly smaller than the other, with cutting edges forming the periphery of one end of each opening, the dies beingpositioned together with the openings in alinement and with each cutting edge on one die in substantially the saine plane as a cutting edge on the other die, the top of the second die being conical and contacting With a conical recess in the -`lbase of the first die, the dies beingprovided with openings extending from the cutting edges of the second die to the exterior of the dies.

6. A die to be used with a second die having an opening therethrough and cutting edges forming the periphery of the opening, and a plurality of recesses in the base of the die extending from the opening to the exterior of the die.

7. A die to be used With a second die having an opening therethrough and cutting edges forming the periphery of the opening, the base of the die having a conical recess and a plurality of recesses in such conical surface extending from the opening to the exterior of the die.

RICHARD LESTER VVILCOX. 

